SKYCALC Sky Model Calculator

SkyCalc Sky Model Calculator

Optional Parameter Initialisation using Almanac Service

All sky model parameters in the input form below can be set manually, but the time/coordinate dependent ones can be automatically initialised using this almanac service corresponding to a given time and sky position at the Paranal Observatory
at geographic latitude −24°37'38".64 , longitude −70°24'17".64.

Date and UT time h:
m

Target equatorial coordinates

R.A. α= °

dec δ=
°

The Cerro Paranal Advanced Sky Model

Altitude of Target above Horizon

Alt= [19.5, 90] °

Alt and X are coupled through the plane parallel approximation X=sec(z),
z being the zenith distance z=90°−Alt

Thermal EmissionThis radiance component represents an instrumental effect.
The emission is provided relative to the other model components.
To obtain the correct absolute flux, an instrumental response curve must be applied to the resulting model spectrum
(see section 7.2.4 in the documentation).